In contrast to CD44, ABCG2 knockdown inhibited clonogenic activities of both LAPC9 (Figure 9H; Supplementary Figure 11E) and Du145 (not shown) CD44+ cells, which is consistent with ABCG2 enrichment and also suggests its functional significance in the two CD44+ PCa cell populations. Here, ABCG2 is linked to posterior cortical atrophy.